According to Google,
Reese's Peanut Butter Cups. Reese's Peanut Butter Cups are candy bars made of chocolate-coated peanut butter marketed by The Hershey Company that pioneered the way to the generic peanut butter cup. They were created in 1928 by H. B. Reese, a former dairy farmer and shipping foreman for Milton S. Hershey.